I would like to ask for output of this script:

cat <<EOF | foreman-rake console
require 'pp'
Foreman::Model::Vmware.all.each do |cr|
  service = cr.send(:client); ""
  pp cr.attributes.except('password')
  raw_networks = service.list_networks(:datacenter => cr.datacenter)
  pp raw_networks
end;""
EOF

This will print information about the compute resources and the available networks.

After analylizing the provided source and additional data, it seems the issue was in applying wrong patch to address https://bugzilla.redhat.com/show_bug.cgi?id=1394290: it seems the patch 'vsphere-unique-networks.patch' was applied, which was later in the original BZ as commented in https://bugzilla.redhat.com/show_bug.cgi?id=1394290#c40, where also the right patch is provided. To fix the issue, I suggest first reverting the original patch and then applying the new one:

  cd /usr/share/foreman
  # revert the original patch
  patch -Rp1 < ~/vsphere-unique-networks.patch
  # apply new patch
  patch -p1 < ~/vsphere-dvportgroup-key.patch
  service httpd restart

After doing this, it might be needed to re-save the compute profile used while using the previous patch, but should help with the original issue.

In case this doesn't help, please share latest sosreports and fresh tar of `/usr/share/foreman` to see the state of sources after reversing the old patch and applying the new one

Since this issue was caused by applying wrong patch to resolve https://bugzilla.redhat.com/show_bug.cgi?id=1394290, I'm closing this BZ as NOTABUG